Cold and dampness in the nature of the evil, caused by the symptoms, treatment and other aspects are different. 1. Nature of the evil: Cold is the cold evil, with cold, collection, stagnation characteristics. Dampness is wetness, with heavy, sticky characteristics. 2. Symptoms: Cold invades the body, can lead to fear of cold, joint flexion and extension of unfavorable, mental instability and so on. When dampness invades the body, it can cause edema, acidity and heavy, sticky stools. 3. Treatment: After the invasion of cold qi, it should be treated by warming yang and dispersing cold. After the invasion of dampness, it should be treated with the medicine of light osmosis and diuresis. Cold and dampness are both yin evils, and often appear together in clinical practice. Patients should be treated with medicines under the guidance of a doctor.